what I did for mine was to delete/comment out all the occurrences of the line containing COM_siteHeader (I can't remember offhand but it's roughly $display = COM_siteHeader with a dot somewhere), and just replace it with
echo COM_siteHeader();
4 files has that line (index.php, admin's index.php, gkaddentry and geekbadd).
As I mentioned
here, I'm no PHP expert and i'll be gratefuly if someone more knowledgeable thinks that's ok to do...